CN103931499A - Tissue culture rapid propagation method for callistemon rigidus - Google Patents

Abstract

The invention discloses a tissue culture rapid propagation method for callalica, belonging to the technical field of plant tissue culture. The cultivation steps are: (1) selection and disinfection of explants; (2) primary cultivation; (3) subculture; (4) rooting cultivation; (5) hardening and transplanting. According to the above cultivation method, the seedlings have strong adaptability after hardening and transplanting, so that the survival rate of hardening and transplanting of Melaleuca weeping plantlets can reach more than 95%. Compared with conventional seed propagation and cutting propagation, the rapid propagation method of tissue culture greatly shortens the seedling cultivation period of Melaleuca weeping branch, which can greatly improve the reproduction efficiency. The seedling cultivation cycle is shortened from 1 year to 3 to 4 months. The number of batches of seedlings raised each year is increased from 1 batch to 4 to 8 batches, which has broad market application prospects.

Description

A kind of rapid propagation method of tissue culture of Melaleuca

technical field

The invention belongs to the technical field of plant tissue culture, and in particular relates to a method for rapid propagation of melaleuca tissue culture.

Background technique

Callistemon viminalis is native to Australia. It is an evergreen shrub or small tree of the genus Callistemon in the family Myrtaceae. Its flowers are shaped like test tube brushes, so it is also called bottle brush tree and red bottle brush. The plant has wide adaptability and can grow in warm and hot climates, and can also adapt to hotter or colder climates. It is suitable for cultivation in moist, loose fertile soil, but it can also grow well in poor and dry soil. The plant has strong germination power, slow growth, resistance to pruning, and strong resistance to air pollution.

As a flower and tree with great ornamental value, Melaleuca has a beautiful plant shape, slender and hanging branchlets, and a weeping willow-shaped crown. The leaves have transparent oil glands, which smell of aromatic oil when rubbed. The flowers are densely grown in the leaf axils on the top of the branches. The flowering period is from March to May and October. The spikes are unique and beautiful. When they are in full bloom, red flowers press down on the branches, which is very elegant. It is used for landscaping in parks, scenic areas, residential areas, roads, etc. It can be matched with a variety of plants, and planted in solitary, cluster, and patch plants to create a rich garden landscape. The plant is also an excellent economic tree species and has good medicinal value.

Propagation by seeds, propagation by cuttings and grafting are common conventional propagation methods for trees. By far the most common method of propagation for Melaleuca plants is by seed propagation. However, on the one hand, the fruit of Melaleuca weeping will crack immediately once it matures, and the seeds are very easy to scatter, difficult to collect, and its seeds are extremely small, with a long post-ripening period and low germination rate; The survival rate of cutting propagation of Melaleuca is low; as for grafting propagation, it is also necessary to first cultivate rootstock seedlings through seed propagation or cutting propagation. Therefore, several commonly used conventional propagation methods are not suitable for large-scale application of Melaleuca weeping tree, which is a characteristic excellent landscaping tree species. In response to this problem, in order to meet the needs of the market, it is urgent to establish a new breeding technology system.

Tissue culture rapid propagation is a new method for rapid propagation of seedlings based on tissue culture. At present, there are few studies on tissue culture rapid propagation of Melaleuca plants at home and abroad, and there are even fewer comprehensive and systematic studies. Even Australia, the country of origin, has not established any tissue culture rapid propagation of Melaleuca plants. Technology System. Therefore, we took this genus of Melaleuca weeping branch as the object of research, in order to explore and establish its tissue culture rapid propagation technology system, provide technical support for its large-scale, standardized, and industrialized seedling cultivation, and meet production needs. The application of Melaleuca has great theoretical and practical significance.

Contents of the invention

The purpose of the present invention is to provide a method for rapid propagation of Melaleuca tissue culture, to provide technical support for the large-scale, standardized, industrialized, and year-round seedling cultivation of Melaleuca, and to provide a theoretical and technical basis for further genetic breeding. The introduction and popularization of plants in my country has important theoretical and practical significance.

The object of the present invention is achieved through the following technical solutions.

1. a tissue culture rapid propagation method of Melaleuca, comprising the following steps:

1) Selection and sterilization of explants: Use the semi-lignified weeping Melaleuca branches of the year as explants, cut the branches into 2-3cm stems with axillary buds, cut off the leaves, and wash the dust with running water , soaked in detergent solution for 3 minutes, and then rinsed with running water for 2 hours; on the ultra-clean workbench, soak the stem segment in 70% alcohol for 30 seconds, shake it for 25 seconds, pour off the alcohol and rinse it with sterile water for 5 times, and then rinse it with 0.1 % mercuric chloride for 8 minutes, shake it every 2 minutes, rinse it with sterile water 5 to 7 times, put it into sterile water and soak it for later use;

2) Primary culture: Cut off 1-2 mm of the explant wound after sterilization, insert the end vertically downward into the Y1 medium, culture for 3-7 days, transfer to a new Y1 medium, and continue to cultivate for 10 days. ~15d to grow new shoots;

3) Sprout elongation culture: Cut off the blackened part of the base of the sprout stem segment and transfer it to Y2 medium for sprout elongation culture. After 20 days, the sprout elongates to ≥3.0cm;

4) Subculture proliferation culture: cut the elongated shoots into small pieces of about 1 cm, transfer them into Y2 medium for subculture proliferation culture, and after 25 to 30 days, the proliferation new shoots germinate and elongate to more than 2 cm; Proliferation and culture generations shall not exceed 4 generations;

5) Rooting culture: Cut off the new shoots that grow to more than 2cm in step 4), remove the leaves near the base of the medium and transfer to the Y3 medium, and grow new roots after 15 days of cultivation;

6) Seedling hardening and transplanting: Open the cap of the tissue culture bottle of the rooted plant for 3 days; take out the rooted seedling, wash the root medium, and cultivate it in tap water for 5 days, and cover the water cup with a polyethylene plastic bag to keep the humidity; take out the rooted seedling, Transplant into pots with substrates, keep the temperature at 22-25°C, humidity at 85-95%, and shade properly.

Wherein, the components of each medium are:

Y1 medium: MS basic medium (see the following MS basic medium description for the dosage of each component), 30g/L sucrose, 7.5g/L agar powder, 0.1mg/L 6-benzylaminoadenine (6-BA), 0.05mg/L naphthaleneacetic acid (NAA), pH 5.8;

Y2 medium: MS basic medium, 30g/L sucrose, 7.5g/L agar powder, 1.0mg/L6-BA, 0.2mg/L NAA, pH 5.8;

Y3 medium: MS basic medium with halved macronutrients, 20g/L sucrose, 7.5g/L agar powder, 0.25mg/L indolebutyric acid (IBA), 0.25mg/L NAA, pH 5.8;

Wherein, the culture conditions described in steps 2-5 are: the temperature is 23-27° C., irradiated with 1400 Lx light intensity for 16 hours every day, and then stored in a dark box for 8 hours.

The beneficial effects of the present invention are: aiming at the problem that the conventional propagation efficiency of Melaleuca is very low, the tissue culture rapid propagation technology system of this tree species is established for the first time, so that the seedling propagation is not limited by time, season, climate and site, greatly improving The seedling raising cycle is shortened, the seedling raising efficiency is greatly improved, the seedling raising cycle is shortened from 1 year to 3 to 4 months, and the number of seedling raising batches per year is increased from 1 batch to 4 to 8 batches, providing an effective way for its large-scale promotion and application.

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments.

Example 1:

A tissue culture rapid propagation method of Melaleuca, specifically as follows:

1) Selection and sterilization of explants: Use the semi-lignified weeping Melaleuca branches of the year as explants, cut the branches into 2-3cm stem segments, cut off the leaves, wash the dust with running water, and Soak in detergent solution for 3 minutes, then rinse with running water for 2 hours; soak the stems in 70% alcohol for 30s on the ultra-clean workbench, shake for 25s, pour off the alcohol and rinse with sterile water for 5 times, then rinse with 0.1% alcohol Soak in mercuric acid for 8 minutes, shake it every 2 minutes, rinse it with sterile water 6 times, put it into sterile water and soak it for later use;

2) Primary culture: Cut off 1-2mm of the explant wound after sterilization, insert the end vertically downward into the Y1 medium, transfer to the new Y1 medium after 5 days of culture, and continue to cultivate for 12 days to grow out sprout;

3) Sprout elongation culture: Cut off the blackened part of the base of the sprout stem segment and transfer it to Y2 medium for sprout elongation culture. After 20 days, the sprout elongates to ≥3.0cm;

4) Subculture proliferation culture: cut the elongated shoots into small pieces of about 1 cm, transfer them into Y2 medium for subculture proliferation culture, and after 28 days, the proliferation new shoots germinate and elongate to more than 2 cm; subculture proliferation The culture algebra is 4 generations;

5) Rooting culture: Cut off the new shoots that grow to more than 2cm in step 4), remove the leaves near the base of the medium and transfer to the Y3 medium, and grow new roots after 15 days of cultivation;

6) Hardening and transplanting: Open the cap of the tissue culture bottle of the rooted Melaleuca plant for 3 days; take out the rooted seedling, wash the root medium, and cultivate it in tap water for 5 days, and cover the water cup with a polyethylene plastic bag to keep the humidity; Rooted seedlings are born, transplanted into pots with substrates, kept at a temperature of 22-25°C, humidity of 85-95%, and proper shade, the survival rate reached 95%.

Wherein, the culture conditions described in steps 2-5 are: the temperature is 25±2° C., irradiated with 1400 Lx light intensity for 16 hours every day, and then stored in a dark box for 8 hours.

Wherein, the components of each medium are:

Y1 medium: MS basic medium, 30g/L sucrose, 7.5g/L agar powder, 0.1mg/L 6-benzylaminoadenine, 0.05mg/L naphthaleneacetic acid, pH 5.8;

Y2 medium: MS basic medium, 30g/L sucrose, 7.5g/L agar powder, 1.0mg/L 6-benzylaminoadenine, 0.2mg/L naphthaleneacetic acid, pH 5.8;

Y3 medium: MS basic medium with halved macronutrients, 20g/L sucrose, 7.5g/L agar powder, 0.25mg/L indolebutyric acid, 0.25mg/L naphthaleneacetic acid, pH 5.8;

The content (g/L or mg/L) refers to the weight-to-volume ratio of each component to the total medium, such as 30g/L sucrose in Y1 medium, which means 30g of sucrose per 1L of Y1 medium .

The MS basic medium contains four major categories: macroelements, trace elements, iron salts, and organic components. In Y1 and Y2 mediums, the content of each component of the MS basic medium in the total medium is: macroelements: KNO ₃ (1900mg/L), NH ₄ NO ₃ (1650mg/L), MgSO ₄ 7H ₂ O (370mg/L), KH ₂ PO ₄ (170mg/L), CaCl ₂ (440mg/L); trace elements are : KI (0.83mg/L), H ₃ BO ₃ (6.2mg/L), MnSO ₄ ·H ₂ O (16.9mg/L), ZnSO ₄ ·4H ₂ O (8.6mg/L), CuSO ₄ ·5H ₂ O (0.025mg/L), CoCl ₂ 6H ₂ O (0.025mg/L), Na ₂ MoO ₄ 2H ₂ O (0.25mg/L); iron salts: FeSO ₄ 7H ₂ O (27.85mg /L), Na ₂ EDTA (37.25mg/L); organic components are: glycine (2.0mg/L), nicotinic acid B3 (0.5mg/L), thiamine hydrochloride B1 (0.1mg/L), pyridoxine hydrochloride Pyridoxine B6 (0.5mg/L), inositol (100mg/L).

The macroelements in the Y3 medium were halved, that is, the contents of KNO ₃ , NH ₄ NO ₃ , MgSO ₄ ·7H ₂ O, KH ₂ PO ₄ , and CaCl ₂ were halved, and the contents of other components remained unchanged.

Claims (1)

1. a quick breeding method for tissue culture for callistemon rigidus, is characterized in that comprising the following steps:

1) selection of explant and sterilizing: taking the weeping branch callistemon rigidus branch of raw semi-lignified then as explant, branch is cut into the stem segment with axillary bud of 2～3cm, cuts off blade, clean dust with flowing water, soak 3min with liquid detergent solution, then rinse 2h with flowing water; On superclean bench, first by 70% alcohol-pickled 30s for stem section, shake 25s, removes alcohol and with aseptic water washing 5 times, soak 8min with 0.1% mercuric chloride again, shake once every 2min, and with aseptic water washing 5～7 times, put it in sterile water, soak for subsequent use;

2) first culture: 1～2mm is cut away in explant wound after sterilizing, end is inserted in Y1 medium downward vertically, be transferred in new Y1 medium after cultivation 3～7d, and continuation cultivation 10～15d grows sprouting;

3) sprouting extends and cultivates: in Y2 medium, carry out sprouting and extend and cultivate, be elongated to >=3.0cm of sprouting after 20d being transferred to after the sprouting stem segment base portion blackout Partial Resection growing;

4) shoot proliferation is cultivated: the sprouting after elongation growth is cut into the segment of about 1cm, is proceeded in Y2 medium and carry out shoot proliferation cultivation, breed more than sprouting sprouts and be elongated to 2cm after 25～30d; Shoot proliferation is cultivated algebraically and was no more than for 4 generations;

5) culture of rootage: the sprouting that step 4) is grown to more than 2cm is cut, removes the blade of close medium base portion and is transferred to Y3 medium, after cultivation 15d, grows successively new root;

6) acclimatization and transplants: the tissue culture bottle bottle cap of the plant taking root is opened to 3d; The taking-up seedling of taking root, cleans root medium, running water cultivation 5d, and cover water tumbler with polyethylene plastic bag, keep humidity; The taking-up seedling of taking root, transplants to being equipped with in the basin of matrix, keeps 22～25 DEG C of temperature, and humidity 85～95%, suitably shades,

Wherein, the component of described each medium is:

Y1 medium: MS minimal medium, 30g/L sucrose, 7.5g/L agar powder, 0.1mg/L6-benzyl aminoadenine, 0.05mg/L methyl α-naphthyl acetate, pH is 5.8;

Y2 medium: MS minimal medium, 30g/L sucrose, 7.5g/L agar powder, 1.0mg/L6-benzyl aminoadenine, 0.2mg/L methyl α-naphthyl acetate, pH is 5.8;

Y3 medium: MS minimal medium, 20g/L sucrose, 7.5g/L agar powder, 0.25mg/L indolebutyric acid, 0.25mg/L methyl α-naphthyl acetate that macroelement reduces by half, pH is 5.8;

Wherein, the condition of culture described in step 2-5 is: temperature 23-27 DEG C, irradiate 16h, then camera bellows preservation 8 hour by 1400Lx light intensity every day.